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More detailed information on enabling/disabling SNMP is available in the information system
of STEP 7 and in the Communication Function Manual, see Preface (Page 3), Documentation
Guide.
For information on diagnostics via SNMP, see section SNMP (Page 47).
4.7
Program blocks for OUC
Programming Open User Communication (OUC)
The instructions (program blocks) listed below are required for the following communication
services via Ethernet:
• TCP
• ISO-on-TCP
• UDP (Multicast)
• E-mail
For this, create suitable program blocks. The program block can be found in STEP 7 in the
"Instructions > Communication > Open user communication" window.
You will find details on the program blocks in the information system of STEP 7.
Note
Different program block versions
Note that in STEP 7 you cannot use different versions of a program block in a station.
Supported program blocks for OUC
The following instructions in the specified minimum version are available for programming
Open User Communication:
• TSEND_C V3.1 / TRCV_C V3.1
Compact blocks for connection establishment/termination and for sending and receiving
data
As an alternative:
• TCON V4.0 / TDISCON V2.1
Connection establishment / connection termination
• TUSEND V4.0 / TURCV V4.0
Sending and receiving data via UDP
• TSEND V4.0 / TRCV V4.0
Sending and receiving data via TCP or ISOonTCP
SIMATIC CM 1542-1
Operating Instructions, 04/2023, C79000-G8976-C355-05
Configuration, program blocks
4.7 Program blocks for OUC
43
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